US PATENT SUBCLASS 73 / 657
.~.~.~ By frequency or phase shift

Current as of: June, 1999
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73 /   HD   MEASURING AND TESTING

570  DF  VIBRATION {10}
649  DF  .~ Sensing apparatus {5}
655  DF  .~.~ With light beam indicator {2}
657.~.~.~ By frequency or phase shift

DEFINITION

Classification: 73/657

By frequency or phase shift:

(under subclass 655) Subject matter wherein the modification of the light is in the form of a frequency or phase shift which is indicated or measured.